Battery Energy Storage Systems (BESS)

We design and optimize utility-scale battery storage for Finland's reserve markets and demanding weather conditions.

Utility-scale BESS at a high voltage substation in Finland

Grid Stability, Investment Return

The weather dependency of renewable energy is rapidly increasing the need for energy storage. Finland's advanced reserve markets offer excellent revenue opportunities for BESS, but demand extreme reliability from the systems.

BESS projects require deep understanding of electricity markets and control systems. As a local partner, NordEPC knows Fingrid's requirements and helps investors and contractors avoid bottlenecks in permitting and commissioning.

Battery technology assessment (Li-ion NMC, LFP) and sizing optimization
Sizing for Fingrid's frequency reserves (FCR, FFR, aFRR)
Thermal management (HVAC) design for arctic conditions
Electrical design (PCS/Inverters) and Fingrid grid connection

Which battery reserve markets are the most profitable in Finland?

Currently, Fingrid's FCR-D (Frequency Containment Reserve for Disturbances) and FFR (Fast Frequency Reserve) offer excellent returns. aFRR (automatic Frequency Restoration Reserve) is also a growing market. We design systems to participate in multiple markets simultaneously (Revenue Stacking).

How do freezing temperatures in Finland affect BESS systems?

HVAC design for battery containers is critical. The system must maintain cells at optimal temperatures even in -30°C frost, which requires high-quality thermal management and insulation.

Does NordEPC help with Fingrid compliance verification?

Yes. We help ensure that the selected battery and inverter technology meets Fingrid's grid code (VJV/SJV) requirements and support you during commissioning tests.

Related Technical Insights

Deep dive into technical guides, market analyses, and regulatory frameworks.

View all technical insights

Market Briefing 12 September 2026

Finland BESS Reserve Market Economics: FCR-D vs. FFR vs. aFRR Revenue Comparison 2025–2026

An in-depth analysis of Finland's frequency reserve markets for BESS, comparing FCR-D, FFR, and aFRR revenues, requirements, and stacking strategies for 2025-2026.

bess reserve-markets fingrid

Technical Guide 12 September 2026

Fingrid Grid Connection Process for Foreign Developers: Step-by-Step

A comprehensive, step-by-step technical guide to the Fingrid grid connection process in Finland. Essential reading for international EPCs and renewable energy developers.

fingrid grid-connection finland

Maximize your BESS project returns

Our experienced engineers help with technology selection and grid connection.